Method for manufacturing secondary battery and secondary battery using same

Abstract

The present invention relates to a method for manufacturing a secondary battery and a secondary battery using the same, which can improve the quality of a cut surface of an electrode plate and improve the reliability of the secondary battery. For example, disclosed is a method for manufacturing a secondary battery, the method comprising: an active material layer forming step of forming an active material layer by coating an active material on both surfaces of a collector plate; an active material layer removing step of removing a part of the active material layer by irradiating a laser beam to the both surfaces of the collector plate; and a cutting step of cutting the collector plate by irradiating a laser beam onto the collector plate from which the active material layer has been removed in the active material layer removing step.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for manufacturing a secondary battery and a secondary battery using the same.BACKGROUND ART[0002]In general, unlike a primary battery that cannot be charged, a secondary battery can be recharged. A low-capacity secondary battery comprised of one single cell is used as the power source for various portable small-sized electronic devices, such as cellular phones or camcorders. A high-capacity secondary battery in which several tens of cells are connected in a battery pack is used as power sources for motor drives, such as those in electric bicycles, electric scooters, hybrid vehicles or electric vehicles.[0003]Among various components of a secondary battery, an electrode plate should be accurately cut to be suited to the size of a secondary battery to be manufactured to increase the battery capacity while reducing capacity dispersion, thereby increasing the quality of the secondary battery. In order to accurately cut the e...

AI Technical Summary

Benefits of technology

The patent text describes a method for making a secondary battery with a high-quality cut surface and without contamination or electrical shorts. To achieve this, the current collector plate is cut after removing the active material from a portion to be cut using a laser beam. Additionally, a bead part is formed on the cut surface of the electrode plate to prevent it from penetrating into a separator which can cause electrical shorts. These improvements lead to a more efficient and reliable secondary battery.

Problems solved by technology

However, the cutting using a mold may require frequent maintenance and repair works due to the limited life span of the mold, and the mold may have to be replaced according to a change in the product specification.

In addition, from the viewpoint of quality, a cutting blade may become blunt with repeated uses of the mold, thereby deteriorating cutting quality, and a sharp and keen-edged burr may occur on the electrode plate accordingly.

In addition, since an electrode plate is cut in a state in which an active material is coated on the electrode plate, the active material may be scattered in forms of particles, thereby causing a defect to the secondary battery due to contamination.

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